Your local, trusted source for all of your heating, air conditioning and geothermal needs!

Over 25 years experience

Free Estimates on New Installs 

Financing Available   

We Service all Makes & Models 

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Superior HVAC Repair & Installation Serving Northwest Indiana


STI Heating and Air Conditioning, located in Schererville, IN, is your local, trusted source for all of your heating and air conditioning needs. Our technicians have over 20 years of experience providing residential and commercial heating and air conditioning service to Lake and Porter Counties and the surrounding area. Do you need geothermal HVAC or custom sheet metal work? We offer those services as well. Our technicians are licensed, bonded and insured and we stand behind all of our work. We also offer free estimates on new installs and financing is available.


We pay attention to the little details. It’s one of the reasons we have remained in this business for so long. Reliability, responsiveness, and good, old-fashioned friendly service are the trademarks of our company. Be sure to contact us if you ever need a friendly face in the heating and air conditioning business. Solid work, done right. Call us today.

Man Cleaning Air Filter — Schererville, IN — STI Heating & Air Conditioning

Experienced, Trained Geothermal Specialists



Hundreds of Satisfied Customers | Sales, service, installation and repair


What separates us from many other HVAC contractors is our ability to custom fabricate HVAC curbs and ductwork. No need to look for two vendors to get a commercial unit installed when you have both functions under one roof. Ductwork sends and more are carefully crafted and measured to your exact specifications. You need it, we can construct it. Call today for more information.

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Thank You for the Great Reviews!

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    The pro was courteous and friendly and talked to me in a way that I understood what the issue was without overselling the job.


    Konstantine P.



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    Highly recommend. Fast, professional, affordable work.


    Paul D.

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    They got the job done and works great. Small company that know what they are doing at a reasonable price. I would hire again.


    Al P.

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    Very good


    Raymond S.

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    They show up on time and were very friendly,professional,kind explained everything to this eighth one senior. Project install a C/AC


    Aserine B.

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